Half to cykeneus eockhill



2 Sheets-Sheet 1..

(No Model.)

W. F. GATEWOOD.

ADDING MACHINE.

Patented 0012.. 4, 1887.

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N. PETERS. Phulo-Lvthognphcn \Vashingmm D. (2y

'(N'o'Mod'lf) 2 Sheets-Sheet 2.

W. F. GATEWOOD.

ADDING MACHINE.

E T w a M m/ o in a N. PETERS. Photo-Lithuanian Walhingfinn. D. C,

UNITED STATES PATENT OFFICE.

\VILLIAM F. GATEWOOD, OF HARVARD, NEBRASKA, ASSIGNOR OF ONE HALF TOCYRENEUS ROOKHILL, OF SAME PLACE.

ADDING-MACHINE.

SPECIFICATION forming part of Letters Patent No. 370,777, dated October4, 1887.

Application filed April '7, 1887.

To all whom it may concern:

Be itknown that I, WILLIAM F. GATEWOOD, a citizen of the United States,residing at Harvard, in the county of Clay and State of Ne braska, haveinvented new and useful In1- provements in Adding-Machines, of which thefollowing is a specification.

This invention relates to improvements in adding-machines; and itconsists of the peculiar combination of devices and novel constructionand arrangement of parts, as will be hereinafter fully described, andpointed out in the claims.

In the accompanying drawings, which illustrate'an adding-machineembodying my present improvements, Figure 1 is a perspective view of themachine. Fig. 2 is a vertical sectional View taken on the line as m ofFig. 4, looking in the direction of the arrow. Fig. 3 is a likesectional view on the line y y of Fig. 4, looking in the direction ofthe arrow, this view being taken on the opposite side of the rotatingindex-wheel from the line where the sectional view, Fig. 2, is taken.Fig. 4 is a horizontal sectional view on the line cc of Fig. 2. Fig. 5is a detail view of the rockshaft to be actuated by the keys. Fig. 6 isa detached detail view. Fig. 7 is a front elevation, partly in verticalsection.

Referring to the drawings, in which likelet ters of reference indicatecorresponding parts in all the figures, A designates the inclosingcaseof an adding-machine embodying my invention, which case is preferablymade of the form shown, the bottom board extending for wardly in ahorizontal ledge or extension, a. The top of the case is provided at ornear its middle with a slot or opening, a, through which the numerals onthe periphery of the rotary index-wheel can be readily ascertained, andin front the case is provided with a series of vertical slots, a throughwhich are passed the operating keys or levers which actuate therock-shaft. In every alternate slot a is placed a vertical standard, B,and in rear of the remaining slots is fixed a series of like standards,B, which are thus arranged out of line with the standards B, and arewholly inclosed within the case A. 'Each of these standards B B issuitably fixed or secured to Serial No. 234,046. (No model.)

the base of the inclosing-case, and they are each provided with avertical central slot, 1), in which is fitted one of the series ofoperating keys or levers G O.

There are two series of keys or levers provided, which, for the sake ofconvenience, I will letter C O, the series 0 being longer than theseries 0. There are four of these short keys or levers 0 provided, whichI number from 1 to 4, inclusive, and I provide five of the longer keys0, which are numbered from 5 to 9, inclusive. If preferred, however,another key may be added to the series 0, and the relative numbers ofthe longer keys be changed from 5 to 10, as is obvious. The short keysare arranged alternately between the longer keys, and the short keys arefitted in the slots of the standards B, while the longer keys are fittedin the slots of the standards 13. Each of the series of keys 0 C ispivoted at an intermediate point of its length in its proper standard,and the inner end of each key has a slot or opening, 0, formed therein,through which is passed the headed orhooked upper end cfa verticalconnecting-rod, D, the lower end of each of said connecting-rods beingpivotally connected to a horizontal rock-shaft, E, which is arrangedtransversely across the front of the case, beneath theinner ends of thekeys or levers. This rock-shaft is journaled in suitable bearingsprovided therefor in the case, so as to turn or oscillate axially whenany one of the keys or levers is depressed, and when one of the keys isdepressed to turn the rock-shaft the vertical rods D of the other keyswhich remain untouched move freely through the slots or openings in theinner ends of the levers, so that only the key which is depressed willturn or operate the shaft. The shaft is normally held in a horizontalposition with the keys in an elevated position by means of a spring, E,of either the coiled or fiat class. The movement of the keys or leversis regulated or controlled by means of suitable adjusting-screws, c,which are fitted in the horizontal ledge or extension a on the frontside of the case, one of said regulating-screws be ing provided for eachkey and arranged on the base in the path of the same. Theregulating-screws are turned or adjusted to per- -30 the slot.

mit the levers to have movements or strokes of varying lengths, and thusturn or oscillate the rock-shaft different distances, which shaftthereby controls the length of movement of 5 the feeding-pawl, as willpresently appear. In the upper terminal end of the vertical slot in eachstandard B B is placed a cushion, e, of elastic or resilient material,which serves to limit and cushion the upward movement of the lever onits retrograde movement, as is obvious.

Within the caseA of the machine I provide a vertical fixedsupporting-frame, E", which has the parallel standards E and in theupper I 5 ends of these standards are journaled, free to rotate, theextremities 'of a horizontal supporting-shaft, f, on the middle of whichis affixed or secured, and rotating therewith, an index-wheel, F, oflarge diameter. This wheel is provided with a solid periphery and theradial spokes for lightness, and through the central hub of the wheel ispassed the horizontal shaft. This wheel is provided on its peripherywith numerals from 0 to 99, inclu- 2 5 sive, which are suitably stamped,embossed,

or otherwise indelibly inscribed, and the central slot, a, of the caseis arranged immediately over this index-wheel, so that the numeralsthereon can be readily seen through The index-wheel is further providedwith a series of teeth or pins, f, which correspond in number to thenumerals on the periphery of the wheel. These teeth or pins f projectlaterally from one side of the periphery of the wheel, for a purposepresently described.

A vertical standard, G, is arranged in front of the frame E and to oneside of the rotating index-wheel F, and to the inner edge of thisstandard nearest to the index-wheel I afiix a vertical bracket, G, whichis arranged in line with and to one side of the projecting teeth or pinsf of the index-wheel. In this vertical bracket is pivoted agravity-pawl, H, which 5 is made heavy at its lower free end, so thatthe nib or point thereof will be normally swung or thrown rearward ofits pivot and into the path of the teeth of pins f on the indexwheel, tothereby prevent retrograde movement of the said wheel.

A swinging arm, I, is fitted on the horizontal supporting-shaft f, onone side of the index-wheel thereon, -and this arm is free to swing orturn on the shaft independently of 5 5 the rotary motion of said shaftwith the indexwheel F. The free end of this arm is recessed, as aw,and'in this .recess is fitted a feedingpawl, I, which is pivoted at itsinner end and is free at its outer end, so as to take into the teeth .orpins of the index-whee]. This swinging arm is normally arranged inapproximately a horizontal position,with the free end of thefeeding-pawl in close proximity to the retaining-pawl H, and said end ofthe arm is thus normally arranged above the horizontal rock -shaft, aswill be readily understood. The free end of the feeding'pawl is normallyheld or pressed between two adjoining teeth or pins f on the index-wheelwhen the pawl is at rest, by means of a spring, I, which is secured atone end to the swinging arm and rests at its free end upon the pawl. Theswinging arm I is actuated by the rock-shaft, which is connected to thearm through the medium of a rocking arm, E, which projects rearwardlyfrom the shaft, and a connectingrod, E which is pivoted at the inner endof the rocking arm and to the swinging arm Iat a point in rear of thepawl 1.

It will be readily understood that when one of the keys 0 or C isdepressed by the pressure of one of the fingers of the operator's handthereon, the rock-shaft will be elevated against the tension of thereturn-spring and the rocking arm E, which is fixed to the shaft, willlikewise be elevated to force the connecting-rod upwardly and therebyraise the swinging arm I. With the upward movement of the swinging arm Ithe feeding-pawl I will be withdrawn from the teeth or pins f of theindex-wheel, and when the pressure on the key is released the springconnected with the rock shaft E will return the latter to itsnormalposition and thereby draw the arm I downwardly, by which act thefeeding-pawl will move or feed the index-wheel a distance'eqnal to thedistance which the pawl has been elevated. Each key being capable ofdifferent lengths of movement of stroke will raise the arm andfeeding-pawl past a number of teeth or pins f on the index-wheelcorresponding to the numeralwhichthekeyrepresents. Thuswhen the key 4 isdepressed, it will turn the rock shaft to such an extent as to raise thefeedingpawl past four of the teeth or pinsf. When the key 8 isdepressed,it will raise the feedingpawl past eight of the teeth orpinsf, and so on, as will be readily understood. When one of the keys orlevers is depressed, the pawl l is elevated past a number of pins orteeth f corresponding to the numeral on the key, and when the pressurethereon is released the return-spring of the rockshaft depresses thefeed ing-pawl,which thereby rotates the indexwheel a distance sufficientto expose the numeral on the periphery of the wheel below theobservation-slot a, which numeral thusexposed corresponds to the numberof the key depressed. Thus when in the process of addition the lever 2is depressed, the wheel is fed to bring the numeral 2 beneath theobservation-slot a, the lever 5 is depressed, the index-wheel is movedto expose the numeral 7 below the observation-slot a, and so on.

The top of the inclosing-case A is provided with a supplemental dial, J,on which are indorsed or marked the numerals from 100 to 1,000, and overthis dial traverses an index or hand, j, which is carried by a verticalshaft, 3'', that passes through the top of the case A and has a spurgear-pinion, j", rigidly aflixed to the lower end thereof. Thisgear-pinion is arranged above and to one side of the rotatingindex-wheel F,and it depends from the top of the case in the path ofafixed pin or projection, J, on one side of the index-wheel. This pin orprojection J is affixed to the index-wheel opposite to the zero (0)character thereon, and it is adapted to strike one of the teeth on thespur gear-pinionj each timethe wheelF makes one complete rotation, tothereby turn the shaft 3" and the index or pointerj to indicate ahundred at each complete revolution of the indexwheel, as is obviovs.

I will now proceed to describe my mechanism for returning theindex-wheel to its normal position after one column of figures has beenadded and to begin the addition of another column of figures.

I employ a horizontal lever, K, which is arranged in a plane on theopposite side of the index-wheel from the swinging arm I. This leverextends through the case A and has its rear end pivoted in a verticalpost or standard, 15, which is fixed in the case A. To this lever K isconnected a feeding-rack, L, which is arranged in a vertical positionwithin the case and is pivoted at its upper end to the lever at anintermediate point of the length of the latter. The feedingrack L isthus carried by and depends from the pivoted operating-lever, and it isadapted to engage with a spur gear-pinion, Z, which is secured to one ofthe'ends of the horizontal shaft f, which carries or supports theindex-wheel. This pivoted lever K is normally held in an elevatedposition for instant operation by a spring, K, and the lower or free endof the feeding-rack L is thus normally elevated out of contact with thespur gear-pinion, so that the latter and the shaft f can rotate freelywith the index-wheel F without hinderance from the feeding-rack. Thisfeeding-rack is held in its proper vertical position to engage with thespur gear-pinion Z on the downward stroke of the pivoted lever K bymeans of a spring, L, which is fixed at one end to the lever K and bearsagainst the feeding-pawl at or near its free end, the tension of thisspring L being sufiicient to hold the rack in its proper position whilesuspended, and to prevent it from moving forwardly and being drawn outof engagement with the teeth of the pinion on the downward move ment ofthe said rack.

M designates astop arm, which is arranged at one side of theoperating-lever K and is V pivoted at its rear end on the vertical fixedstandard 70. This stop-arm is provided on one side with alaterally-projecting tooth or spur, m, which normally rests upon theupper side of the operating-lever K, (see dotted lines in Fig. 3,) andfrom the opposite side of the stoparm projects a stop tooth or spur, m,which is arranged in the path of the limiting-pin 121?, which is rigidlyaffixed to the index-wheel F at a point below and in line with theoperating-pin J thereof, and also in line with the character 0. The rearend of this stop-arm Mis provided with an elbow, M, which is preferablyformed integral with the arm, and this arm is adapted to impinge or bearagainst a fixed pin, M on the post It when the opera ting-lever K isdepressed to withdraw its sup port from the prong or tooth m, andthereby allow the free end of the stop-arm to drop or fall slightly andthus adjust its tooth m in the path of the pin hi the said elbow servingto limit the downward movement of the free end of the stop-arm M, sothat it will be rigidly supported to prevent the index-wheel fromtraveling too far around.

The operation of this part of my invention is as follows: After thenecessary calculations have been made to add one column,by manipulatingthe operating keys or levers O O in the manner hereinbefore described,and it is desired to return the index-wheel F to its normal posit-ion,so that the 0 character aligns with the observationslot a, and thusadapt the machine to add a new column of figures, the key 1 is depressedtowithdraw the feeding-pawl from engagement with the teeth or pins f ofthe index-wheel and thus permit the latter to rotate in one directionfreely, the reverse movement of the index-wheel being prevented by thedetaining-pawl H. The free end of the operating-lever Kis now depressedto throw the feeding-rack into engagement with the spur gear-pinion onthe shaftf, which thereby rotates the latter until the numeral 99 alignswith the slot at, when the rotary movement of the index-wheel will belimited in the following manner: Simultaneously with the downwardmovement of the pivoted lever K, the free end of the stop-arm M islowered by its own gravity until the elbow at the pivoted end of thestop-arm comes in contact with the fixed pin M, which thus supports thestoparm in position and so that its tooth or spur m is in the path ofthe pin on on the index wheel F, said pin striking against the tooth orspur m of the stop-arm when the numeral 99 registers with theobservation slot at, and thereby arrests the motion of the index-wheel.The pressure on the lever or key 1 is now released to thereby feed theindex-wheel one step, which brings the characterO in line with theobservation-slot, and the lever K is re leased and elevated by itsspring. This elevation of the feedingrack and lever K does not affectthe position of the index-wheel, because it is held against reversemovement by the detaining-pawl H engaging with the pins or teeth f.

In order to return the hundreds index or pointer j to 0, I provide apivoted toothed segment, P, which is supported on the inner side of thetop of the case A and engages with the spur gear-pinion on the shaft j,and this segment has an extended arm, 1), to which is pivoted the innerend of a push-rod, P, which extends through a suitable opening or slotin the front wall of the case. By moving the push-rod P in the properdirection the segment will be turned on its pivot to rotate the pinionand thus turn the shaft or arbor until the index or pointer registerswith the character 0.

IIO

Q designates a fixed standard, which is arranged in the front part ofthe inelosing-case and to one side of the rotating index-wheel F, and onthis standard is pivoted a horizontal lever-arm, B, said arm beingpivoted centrally to the said standard. One end of the leverarm extendsover and is arranged in the path of the free end of the pivoted lever K,and to this end of the lever-arm is pivoted a latch, 7*, which has atooth, r, on its lower end, which is adapted to take under the fixedstop-pin r on the front side of another standard, R, which is fixed inthe lower end of the case. This lever-arm rests upon and is movedvertically with the pivoted lever K, so that its outer end, to which thelatch is connected, is normally elevated, and the inner end of thelever-arm has the upper end of an operating-rod, S, pivotally connectedthereto, the lower end of the said rod S being passed through a suitableguide, 8, on the upper end of thestandard G, and having an elbow, .9,which is arranged beneath and in the path of the swinging arm I. Whenthe outer end of the lever K is depressed, the outer end of the arm Rmoves therewith, so that the latch r will ride over the pin and hold thelever-arm in this position until the lever K is raised by itsreturn-spring, and simultaneously with the downward movement of theouter end of the lever-arm R the inner end of the latter is raised todraw upon the operating-rod S, and elevate the latter so that its elbows will take against the. lower end of the swinging arm I to raise thelatter, and thus withdraw its pawl I from engagement with the teeth orpins f of the indexwheel. The outer end of the lever-arm R works betweenthe fixed pin r and the pin r, was to be limited thereby, and to thesaid end of the lever-arm is pivoted an elbow-lever, T, one arm of whichrides or impinges against the lever K, while the other arm has a nib, t,which takes beneath the pin 1" when the leverarm Ris elevated. By meansof the lever-arm being connected to and operated by the lever K, andhaving the operating-rod S to raise or elevate the feeding-pawl from theteeth or pins f of the index-wheel simultaneously with the downwardmovement of the lever K, I may dispense with the operation of depressingthe key or lever 1, in order'to return the indexwheel to its normalposition.

The operation of my invention will be readily understood from theforegoing description, taken in connection with the drawings, by thoseskilled in the art to which my invention relates.

I would state that while I deem the mechanisms herein shown anddescribed as best adapted for carrying my invention into effect, still Ido not wish to confine myself to the precise details of construction,but hold myself at liberty to make such changes and alterations asfairly fall within the scope of my inven- -tion.

Having thus fully described my invention, .what I claim as new, anddesire to secure by Letters Patent, is

1. In an adding-machine, the combination, with an inclosing-case havingan inspectionopening in its top, of a shaft, a rotating in dex-wheelmounted on said shaft, a series of pins extending from the said wheel, aplate hung loosely on said shaft and carrying a spring pawl to engagesaid pins, a rockshaft parallel with the wheel-shaft and journaled ateach end in the case and having a single connection with the pawl-plate,and a series of keys independently connected to said rock-shaft andextending through the case, as set forth.

2. In an adding-machine, the combination of the inclosing-case, shaftf,having the wheel Fand a pawl-plate mounted thereon, as described, pinsf, projecting from the wheel F, spring-pawl I, engaging said pins,rock-shaft E, rod E connecting said shaft to the pawlplate, a series ofkeysindependently connected to the rock-shaft, and a series ofset-screws arranged under the outer ends of the keys to limit the playof the same, substantially as set forth.

3. In an adding-machine, the combination of the inclosing-case having aseries of slots in its front, a shaft, f, having a wheel, F, and a pawlplate mounted thereon, as described, pinsf' on the wheel F, a springpaw], I, a rock-shaft, E, connected with the pawl-plate, slottedstandards B B, arranged coincidently with the slots in the front of thecase, and a series of keys or levels pivoted in said standards andconnected to the rockshaft, substantially as specified.

4. In an adding-machine, the combination, with an inclosing-case, ofashaft, f, having the wheel F and a pawl-plate mounted thereon, asdescribed, pinsf', a spring-pawl,I, operatingkeys and connections withthe pawl-plate, a pinion rotating with said wheel, a rack andoperating-rod, and a spring for throwing said rack out of engagementwith the pinion, substantially as set forth.

5. In an adding-machine, the combination, with an inclosing-case, ofashaft, f, having the wheel F and a pawl-plate mounted thereon, asdescribed, pins f, aspring-pawl,l, operatingkeys and their connectionswith the pawlplate, a pinion rotating with said wheel, a lever, K, and arack hung thereto, a spring for normally throwing said rack out ofengagement with said pinion, and a spring for throwing said rack towardthe pinion, substantially as set forth.

6. In an adding-machine, the combination of a shaft carrying anindex-wheel provided with a stop-pin, a lever for rotating the shaft andwheel, and a stop-arm controlled by the lever and normally held therebyout of the path of the stop-pin on the index-wheel, said stop-arm beingautomatically thrown into the path of the pin on the wheel when thelever is operated to rotate the wheel, as and for the purpose described.

7. In an adding machine, the combination of a rotating wheel having astop-pin, a lever for rotating the wheel, and a stop -arm cntrolled bythe lever and thrown automatically into the path of the stop-pin whenthe lever is operated, as and for the purpose described.

8. In an adding-machine, the combination of a rotating wheel having astop-pin, an operating-lever for rotating the wheel in one direction,and a pivoted stop-arm supported by the lever out of the path of thestop-pin when the lever is at rest, said arm being thrownautomaticallyinto the path of the stop'pin when the lever is depressed,as and for the purpose described.

9. In an adding-machine, the combination of a rotating wheel, a lever,K, for moving the wheel in one direction, a pivoted stop-arm having theelbow at one end and the laterallyprojecting tooth or spurs at its freeend, one of which rests on and is supported by the lever to hold theother tooth or spur normally out of thepath of a stop-pin on theindexwheel, and a fixed pin in rear of the elbow to arrest the downwardmovement of the free end of the stop-arm when the lever is depressed, asand for the purpose described.

10. In an adding-machine, the combination of a rotating index-wheelhaving the operating-pin projecting therefrom, a shaft carrying apointer or index at one end and aspur gearpinion at its other,which isarranged in the path of the operating-pin on the index-wheel, anoperating segment adapted to be thrown into gear with the pinion, and apush-rod connected to the segment, as and for the purpose described.

11. The combination, in an adding-machine, of a rotating index-wheelhaving the teeth, a feeding-pawl, an operating-lever, K, for rotatingthe index-wheel in one direction, a lever-arm controlled by theoperating-lever, and an operating-rod connected to the lever-arm forraising the feeding-pawl from engagement with the teeth of theindex-wheel when the operating-lever is depressed, as and for thepurpose described.

In testimony that I claim the foregoing as my own I have hereto affixedmy signature in presence of two witnesses.

WILLIAM F. GATEWOOD.

Witnesses:

G. S. BABOOOK, T. A. BARBOUR.

